Battery module including flame-retardant sheet, and battery rack and energy storage system including the same

Patent metadata

Field	Value
Publication number	US-12525682-B2
Application number	US-202117771853-A
Country	US
Kind code	B2
Filing date	Jan 14, 2021
Priority date	Jan 15, 2020
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A battery module includes at least one cell assembly including a plurality of secondary batteries, each of which has an electrode lead, a module housing having an inner space formed to accommodate the cell assembly therein, a bus bar assembly including at least one electrically conductive bus bar having a plate shape and configured to contact a portion of the electrode lead, and at least one electrically insulating bus bar frame to which the at least one bus bar is mounted, the at least one bus bar frame having a plurality of perforated holes through which the electrode leads of the plurality of secondary batteries passes and a flame-retardant sheet having a plate shape and located in close contact with an outer side of the bus bar to close the perforated hole.

First claim

What is claimed is:

1 . A battery module, comprising:
at least one cell assembly including a plurality of secondary batteries, each secondary battery of the plurality of secondary batteries having an electrode lead; a module housing having an inner space formed to accommodate the cell assembly; a bus bar assembly including at least one electrically conductive bus bar having a plate shape and configured to contact a portion of the electrode leads, and at least one electrically insulating bus bar frame to which the at least one bus bar is mounted, the at least one bus bar having a plurality of perforated holes through which the electrode leads of the plurality of secondary batteries passes; and a flame-retardant sheet having a plate shape and located in contact with an outer side of the at least one bus bar to close the plurality of perforated holes, wherein the flame-retardant sheet has a plurality of welding holes through which a portion of the electrode leads in contact with the at least one bus bar is exposed to the outside, and wherein the flame-retardant sheet has a plurality of ridged portions formed on an inner surface thereof facing the at least one bus bar to be ridged inward, the plurality of ridged portions being shaped to surround an outer circumference of a respective one of the plurality of welding holes.

2 . The battery module according to claim 1 , wherein the plurality of secondary batteries are stacked on each other in a front and rear direction and configured to include the electrode leads respectively located at a left end and a right end thereof,
wherein the bus bar assembly is provided at a left side and a right side of the cell assembly, respectively, wherein the at least one bus bar has a plurality of insert holes formed therein to communicate with a respective one of the plurality of perforated holes, wherein the at least one bus bar frame includes: a body portion having a plate shape so that the at least one bus bar is mounted to an outer surface thereof and configured to extend in a direction along which the plurality of secondary batteries are stacked; and at least two fixing portions configured to protrusively extend outward from the body portion so as to be coupled to the flame-retardant sheet, the flame-retardant sheet is inserted to be interposed between the at least two fixing portions.

3 . The battery module according to claim 2 , wherein the flame-retardant sheet further includes a protrusion formed to protrude inward so that a portion of the protrusion is inserted into an insert hole of the plurality of insert holes of the at least one bus bar.

4 . The battery module according to claim 3 , wherein each fixing portion of the at least two fixing portions has a fixing hole in which an outer circumference of the flame-retardant sheet is inserted.

5 . The battery module according to claim 3 , wherein each fixing portion of the at least two fixing portions has at least one fixing protrusion extending into a space between the at least two fixing portions formed to press an outer circumference of the flame-retardant sheet inward so as to be fixed.

6 . The battery module according to claim 3 , further comprising:
a pressing pin configured to press a portion of the flame-retardant sheet facing the insert hole of the at least one bus bar, the pressing pin having one end attach to a fixing portion of the at least two fixing portions and extending into a space between the at least two fixing portions.

7 . A battery rack, comprising at least one battery module according to claim 1 .

8 . An energy storage system, comprising at least one battery rack according to claim 7 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Hong Sung-Goen
• Kim Seung-Hyun
• Lee Young-Seok
• Bae Kyung-Hyun
• Shin Jin-Kyu

Classifications

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title

• H01M50/505

  comprising a single busbar · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/613

  Cooling or keeping cold · CPC title

• H01M10/625

  Vehicles · CPC title